This is an older micro-switch controlled machine, it did not have a guide bar with a counter like the newer microprocessor machines have. In order to add a guide bar with a counter (without drilling a hole in the concrete) the cylinder assemble mounting holes were re-drilled with an offset of 5/8" toward the rear of the machine. This moves the entire cylinder assembly towards the front of the machine allowing enough space to get the guide/counter bar to fit between the cylinder assembly and machine base.